What Google knows about you – and how to make it forget

By Thomas Macaulay,Techworld.com|

Google's parent company Alphabet quietly ditched the 'Don’t be evil' motto from its code of conduct in 2015 after a string of stories suggesting the pithy slogan was somewhat undeserved. According to WikiLeaks founder Julian Assange, the company has quietly collected more data than the NSA.

With a limitless data mine to quarry and the machine learning and artificial intelligence tools to turn it into revealing insights, Google might know more about you than you know about yourself.

It's a Faustian pact that most of us are happy to make for the rich range of services we receive in return, but the true terms of the deal may not quite match what you thought you had signed up for.

Read on to find out what information that the tech titan has gathered about you, and how you can get it back.

Google is using iRobot's autonomous vacuum cleaners to create real-time maps of the inside of people's homes.

iRobot's new Roomba i7+ robot vacuum cleaner remembers the floor plan of homes by using odometry to measure the rotation of Roomba's wheels and a low-res camera to recognise furniture and walls, ostensibly to cover the area efficiently. It then stores the data so users can customise cleaning schedules and locations.

iRobot shares the floorplan mapping data with Google to help the company develop smart home technology by understanding room layouts and the locations of devices.

The iRobot CEO Colin Angle told the Verge that the data would not be used for targetted advertising

"This data doesn't help current Google products," she said. "This data is not getting fed into some larger morass of Google information."

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Google knows your personality

The data Google mines paints a vivid portrait of the person you are. Your age, gender, and interests are predicted by its algorithms with impressive accuracy.

If you fancy a change of personality and being presented a different set of advertisements, you can change your personal data and the personalised ads it's used to form by clicking Manage ad settings in the personal information section of your Google account.

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Google knows what you’ve said

Every time you speak to Google it records your voice. The company says it collects this data to improve its voice recognition software and only records it when users opt-in.

You can find and delete all the recordings of all your Google voice searches and your Google Now and Google Assistant commands by going to the Voice & Audio area of the My Activity section of your Google account.

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Google knows who your friends are

Gmail correspondence means your contacts are all logged. Not only does Google know who you've been in touch with, it knows which of them you like best.

Google Contactskeeps a record of who you've interacted with the most, and lets you remove any of the people you no longer want in your life.

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Google knows what you’ve seen

Google acquired YouTube for $1.65 billion in 2006. What seemed expensive at the time looks a bargain today, and not only for the advertising revenue. The company can also track exactly what you've searched for and watched on the video-sharing service.

You can find a full history of the videos you've searched for, viewed and voted for and update your privacy settings in the YouTube section of your Google Dashboard.

Every site you've ever visited is stored in Google, Chrome and your Android apps. It knows when you search and what you search for, how many searches you've made and your top queries.

It's easy enough to clear your search history, but that doesn't mean it no longer exists. Follow Google's instructions to permanently erase the past and limit the tracks of the future.

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Google knows almost everything you’ve done with your Android phones

Another of Google's most successful acquisitions was that of mobile operating system Android, which Google bought for an estimated $50 million in 2005. Every Android device ever used is known to Google, and everything that's been done with them.

Your contacts, call logs, messages, voice command, where you've been, your browsing data, and the apps you've downloaded from the Google Play store casts a long and revealing shadow.

You can find out exactly what is known and limit what is tracked using the filter available in the Item view of the My Activity section of your Google account.

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How to find out exactly what Google knows

Google released a new dashboard feature last June that reveals exactly what it knows about you.

My Activitydisplays all your search history, the links you've clicked on, the YouTube videos you've watched and the Google Map searches you've made all in one timeline, and lets you expunge all of them as specific items or as entire topics of content.

It also offers the option to determine what data will be associated with your account in the future.

Another setting lets you decide what kind of advertising you receive. Under the Ads Settings section of your Google Account you can review the current commercial offerings based on your existing user information, and choose which type you no longer want to see.

Google also provides a comprehensive Dashboard showing all the personal data collected through your Google account and the devices attached to it, and lets you edit the privacy settings as you see fit.